This Deseret News article has the details:
After a day of student interviews and reviewing audit trails, Evans said he believes the gaffe ironically occurred during a spell check. The Daily Universe was using Adobe software called InDesign, which, when it found the word apostle misspelled as "apsotale," suggested "apostate" at the top of its correction list.
"She quickly clicked on the first (suggestion) and moved on," Evans said. "A real unfortunate mistake."
The Deseret News, which also uses the InDesign software, replicated the misspelling and found that Adobe's software does suggest apostate before apostle; Microsoft Word offers it in reverse order.
Imagine how heart-broken I am that my beloved software could inspire such a demonic mistake. InDesign, failing to recognize the sacred nature of an apsotale, offered "apostate" before "apostle." The bleary-eyed student editor, likely late for an Uno game, was so inveigled by InDesign that she picked the first suggested word. Not coincidentally, InDesign has six menu commands and six default panels. Version 6, that is.
According to school officials, there is nothing amusing about this sad, costly, non-Freudian mishap. However, several apsotales were indeed amused. Yeah, verily, they did snicker.